Hi Stephen,

The rte_eal_pci_probe is typically called at the startup.

Now let's say a DPDK application is running with a PCI device (doing tx and rx) and I remove that PCI device underneath (hot plugout)
So how does the application now know that the device is gone ?

Is it that rte_eal_pci_probe should be called periodically from, let's say, the slow control path of the DPDK application ?

Regards
-Prashant


-----Original Message-----
From: Stephen Hemminger [mailto:stephen-OTpzqLSitTUnbdJkjeBofR2eb7JE58TQ@public.gmane.org]
Sent: Wednesday, November 27, 2013 10:16 AM
To: Prashant Upadhyaya
Cc: dev-VfR2kkLFssw@public.gmane.org
Subject: Re: [dpdk-dev] Regarding VM live migration with SRIOV

On Wed, 27 Nov 2013 10:09:09 +0530
Prashant Upadhyaya [off-list ref] wrote:

Hi,

Let me be more specific.
Does DPDK support hot plugin/plugout of PCI devices ?
What typically needs to be done if this is to be achieved inside an application.

Typically, the NIC PF or VF appears to the DPDK application as a PCI device which is probed at startup.
Now what happens if I insert a new VF dynamically and want to use it
inside the DPDK application (while it is already running), how should
this typically be done ? [hotplugin] And what happens if the DPDK
application is in control of a PCI device and that PCI device is
suddenly removed ? How can the application detect this and stop doing
data transfer on this and sort of unload it ? [hotplugout]

If the above can be coded inside the DPDK app, then we can think of live VM migration with SRIOV -- just hotplugin and plugout the VF's.

Regards
-Prashant

The current implementation does look like it supports hotplug.
All devices are discovered during rte_eal_pci_probe.





===============================================================================
Please refer to http://www.aricent.com/legal/email_disclaimer.html
for important disclosures regarding this electronic communication.
===============================================================================